ZC Swap and ECU CEL Code 4

I have just completed a ZC swap into a 88 DX CRX. I converted the harness from a DX to ZC. The car will start and run but i get a CEL Code 4. CYP Crankshaft postion sensor. Now for this engine it is the sensore mounted to the exsaust car? correct. I ran new wire from the sensor to the ECU C1 and C2. I also tried another ECU (Iam using pm6). Should i be using shilded wire? Also i have the connections using butt connectors should i have these soldered? any ideas let me know.